We should manage with a sense of urgency. This should incline us toward giving what we can now rather than saving up in order to give more later. Later may be too late. This has implications for how much of our wealth we leave our children or put aside in charitable foundations. "As long as it is day, we must do the work of him who sent me. Night is coming, when no one can work." (John 9:4)  "He is patient with you, not wanting anyone to perish, but everyone to come to repentance. But the day of the Lord will come like a thief..." (2 Peter 3:9-10)
  

God has built the law of sowing and reaping into the fabric of the universe. He can be trusted to pay us the perfectly appropriate wage for our work. "Remember this: whoever sows sparingly will also reap sparingly, and whoever sows generously will also reap generously." (2 Corinthians 9:6)
  

Giving is an affair of the heart. We should pray that our heart's response is appropriate in light of God's unspeakable gift of Christ to us. "Each man should give what he has decided in his heart to give, not reluctantly or under compulsion, for God loves a cheerful [hilarious] giver. And God is able to make all grace abound to you, so that in all things at all times, having all that you need, you will abound in every good work." (2 Corinthians 9:7-8)
  

It is not difficult to lay aside earthly wealth when you have God as your treasure. "O God, you are my God, earnestly I seek you; my soul thirsts for you, my body longs for you.... Because your love is better than life, my lips will glorify you. I will praise you as long as I live....My soul clings to you; your right hand upholds me." (Psalm 63:1,3,8)